Feet per second.
ft/s to Speed of lights Converter — ft/s to c
Convert ft/s (ft/s) to Speed of light (c) using the exact conversion factor (1 ft/s = 1.016703e-9 speed of light). See the formula, worked examples, and conversion table.
ft/s to Speed of lights converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
Speed of light in vacuum.
Result = input x 0.3048 / 2.99792458e+8.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting ft/s to Speed of lights
ft/s and Speed of light both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Specifically: Feet per second, and speed of light in vacuum.
Formula
speed of lights = ft/s × 1.016703e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 ft/s equals 0.3048 base units, and 1 speed of light equals 299792458 base units, so dividing one by the other gives the direct ft/s-to-speed of light factor of 1.016703e-9.
Simple example
1 ft/s × 1.016703e-9 = 1.016703e-9 c
1 ft/s = 1.016703e-9 speed of lights.
Real-world example
10 ft/s × 1.016703e-9 = 1.016703e-8 c
10 ft/s = 1.016703e-8 speed of lights.
Conversion table
| ft/s (ft/s) | Speed of light (c) |
|---|---|
| 1 ft/s | 1.016703e-9 c |
| 5 ft/s | 5.083517e-9 c |
| 10 ft/s | 1.016703e-8 c |
| 25 ft/s | 2.541758e-8 c |
| 50 ft/s | 5.083517e-8 c |
| 100 ft/s | 1.016703e-7 c |
Reverse conversion: Speed of light to ft/s
1.016703e-9 c × 983571056.4 = 0.9999996438 ft/s
1.016703e-9 speed of lights = 0.9999996438 ft/s.
ft/s = speed of lights × 983571056.43
For a page dedicated to this direction, see Speed of light to ft/s.
Understanding the ft/s (ft/s)
Feet per second.
Understanding the Speed of light (c)
Speed of light in vacuum.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many speed of lights are in 1 ft/s?
1 ft/s equals 1.016703e-9 speed of lights, using the exact defined conversion factor rather than an estimate.
How do I convert ft/s to speed of light?
Multiply the ft/s value by 1.016703e-9. The converter above does this instantly to whatever precision you set.
How do I convert speed of light back to ft/s?
Use the reverse factor: 1 speed of light equals 983,571,056.4 ft/s. You can also use the swap control in the converter above to flip the direction instantly.
What is a ft/s?
ft/s (ft/s) is a unit of speed.
What is a speed of light?
Speed of light (c) is a unit of speed.
Is the ft/s to speed of light conversion exact?
Yes. Both ft/s and speed of light are defined by fixed standards rather than physical artifacts, so the factor of 1.016703e-9 used above is exact to as many digits as you choose to display.